Aquarium filter cartridge



FIG. 1 is a top perspective view of an aquarium filter cartridge showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side being a mirror image;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a cross-sectional view thereof, taken on line 7--7 of FIG. 2, on an enlarged scale. 

The ornamental design for an aquarium filter cartridge, as shown and described. 